By adjusting pH values of reactant system,the mass ratio of stabilizer/water and aging temperature,size controllable spherical silver nanoparticles(NPs) were synthesized.The properties of silver NPs are characterized by X-ray diffraction(XRD),transmission electron microscope(TEM) and ultraviolet visible(UV-VIS) absorption spectra.Within the pH values of 7.0—11.0,the aging temperature of 80 °C is better to improve silver NPs in shape to nearly sphere,concentrate size distribution and reduce aggregation than the aging temperature of 25 °C.The shape and dispersibility of silver NPs are the best when the pH of the reactant system is within 7.0—8.0.With pH of 7.5,aging at 80 °C,and stabilizer/water mass ratio of 1%,the spherical silver NPs with sizes of 50—70 nm were synthesized.The results are promising to be used to synthesize core/shell NPs when silver NPs are as core. By adjusting the pH values ​​of reactant system, the mass ratio of stabilizer / water and aging temperature, size controllable spherical silver nanoparticles (NPs) were synthesized.The properties of silver NPs are characterized by X-ray diffraction (XRD), transmission electron microscope TEM) and ultraviolet visible (UV-VIS) absorption spectra. The pH values ​​of 7.0-11.0, the aging temperature of 80 ° C is better to improve silver NPs in shape to nearly sphere, concentrate size distribution and reduce aggregation than the aging temperature of 25 ° C. The shape and dispersibility of silver NPs are the best when the pH of the reactant system is within 7.0-8.0.With pH of 7.5, aging at 80 ° C., and stabilizer / water mass ratio of 1% the spherical silver NPs with sizes of 50-70 nm were synthesized. The results are promising to be used to synthesize core / shell NPs when silver NPs are as core.